pip install -i https://pypi.tuna.tsinghua.edu.cn/simple -U pip setuptools wheel

# write to $HOME/.config/pip/pip.conf
pip config set global.index-url https://pypi.tuna.tsinghua.edu.cn/simple

# or from CQU mirror
pip config set global.index-url https://mirrors.cqu.edu.cn/pypi/web/simple

pip uninstall -y -r <(pip freeze)

$ pip install pip-tools
$ python -m piptools compile -o requirements.txt pyproject.toml
$ pip install -r requirements.txt